let obj={

    add:function (num1,num2){
    return  num1+num2;
},

    subtract:function(num1,num2){
    return  num1-num2;
},

    multiply:function (num1,num2){
    return  num1*num2;
},

    except:function (num1,num2){
    return  num1/num2;
}
}

    module.exports = obj;